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- '\" $Header: /user6/ouster/wish/man/RCS/place.n,v 1.4 93/04/01 09:52:51 ouster Exp $ SPRITE (Berkeley)
- '/"
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- .HS place tk
- .BS
- '\" Note: do not modify the .SH NAME line immediately below!
- .SH NAME
- place \- Geometry manager for fixed or rubber-sheet placement
- .VS
- .SH SYNOPSIS
- \fBplace \fIwindow option value \fR?\fIoption value ...\fR?
- .sp
- \fBplace configure \fIwindow option value \fR?\fIoption value ...\fR?
- .sp
- \fBplace forget \fIwindow\fR
- .sp
- \fBplace info \fIwindow\fR
- .sp
- \fBplace slaves \fIwindow\fR
- .VS
- .VE
- .BE
-
- .SH DESCRIPTION
- .PP
- The placer is a geometry manager for Tk.
- It provides simple fixed placement of windows, where you specify
- the exact size and location of one window, called the \fIslave\fR,
- within another window, called the \fImaster\fR.
- The placer also provides rubber-sheet placement, where you specify the
- size and location of the slave in terms of the dimensions of
- the master, so that the slave changes size and location
- in response to changes in the size of the master.
- Lastly, the placer allows you to mix these styles of placement so
- that, for example, the slave has a fixed width and height but is
- centered inside the master.
- .PP
- If the first argument to the \fBplace\fR command is a window path
- name or \fBconfigure\fR then the command arranges for the placer
- to manage the geometry of a slave whose path name is \fIwindow\fR.
- The remaining arguments consist of one or more \fIoption\-value\fR
- pairs that specify the way in which \fIwindow\fR's
- geometry is managed.
- If the placer is already managing \fIwindow\fR, then the
- \fIoption\-value\fR pairs modify the configuration for \fIwindow\fR.
- In this form the \fBplace\fR command returns an empty string as result.
- The following \fIoption\-value\fR pairs are supported:
- .TP
- \fB\-in \fImaster\fR
- \fIMaster\fR specifes the path name of the window relative
- to which \fIwindow\fR is to be placed.
- \fIMaster\fR must either be \fIwindow\fR's parent or a descendant
- of \fIwindow\fR's parent.
- In addition, \fImaster\fR and \fIwindow\fR must both be descendants
- of the same top-level window.
- These restrictions are necessary to guarantee
- that \fIwindow\fR is visible whenever \fImaster\fR is visible.
- If this option isn't specified then the master defaults to
- \fIwindow\fR's parent.
- .TP
- \fB\-x \fIlocation\fR
- \fILocation\fR specifies the x-coordinate within the master window
- of the anchor point for \fIwindow\fR.
- The location is specified in screen units (i.e. any of the forms
- accepted by \fBTk_GetPixels\fR) and need not lie within the bounds
- of the master window.
- .TP
- \fB\-relx \fIlocation\fR
- \fILocation\fR specifies the x-coordinate within the master window
- of the anchor point for \fIwindow\fR.
- In this case the location is specified in a relative fashion
- as a floating-point number: 0.0 corresponds to the left edge
- of the master and 1.0 corresponds to the right edge of the master.
- \fILocation\fR need not be in the range 0.0\-1.0.
- .TP
- \fB\-y \fIlocation\fR
- \fILocation\fR specifies the y-coordinate within the master window
- of the anchor point for \fIwindow\fR.
- The location is specified in screen units (i.e. any of the forms
- accepted by \fBTk_GetPixels\fR) and need not lie within the bounds
- of the master window.
- .TP
- \fB\-rely \fIlocation\fR
- \fILocation\fR specifies the y-coordinate within the master window
- of the anchor point for \fIwindow\fR.
- In this case the value is specified in a relative fashion
- as a floating-point number: 0.0 corresponds to the top edge
- of the master and 1.0 corresponds to the bottom edge of the master.
- \fILocation\fR need not be in the range 0.0\-1.0.
- .TP
- \fB\-anchor \fIwhere\fR
- \fIWhere\fR specifies which point of \fIwindow\fR is to be positioned
- at the (x,y) location selected by the \fB\-x\fR, \fB\-y\fR,
- \fB\-relx\fR, and \fB\-rely\fR options.
- The anchor point is in terms of the outer area of \fIwindow\fR
- including its border, if any.
- Thus if \fIwhere\fR is \fBse\fR then the lower-right corner of
- \fIwindow\fR's border will appear at the given (x,y) location
- in the master.
- The anchor position defaults to \fBnw\fR.
- .TP
- \fB\-width \fIsize\fR
- \fISize\fR specifies the width for \fIwindow\fR in screen units
- (i.e. any of the forms accepted by \fBTk_GetPixels\fR).
- The width will be the outer width of \fIwindow\fR including its
- border, if any.
- If \fIsize\fR is an empty string, or if no \fB\-width\fR
- or \fB\-relwidth\fR option is specified, then the width requested
- internally by the window will be used.
- .TP
- \fB\-relwidth \fIsize\fR
- \fISize\fR specifies the width for \fIwindow\fR.
- In this case the width is specified as a floating-point number
- relative to the width of the master: 0.5 means \fIwindow\fR will
- be half as wide as the master, 1.0 means \fIwindow\fR will have
- the same width as the master, and so on.
- .TP
- \fB\-height \fIsize\fR
- \fISize\fR specifies the height for \fIwindow\fR in screen units
- (i.e. any of the forms accepted by \fBTk_GetPixels\fR).
- The height will be the outer dimension of \fIwindow\fR including its
- border, if any.
- If \fIsize\fR is an empty string, or if no \fB\-height\fR or
- \fB\-relheight\fR option is specified, then the height requested
- internally by the window will be used.
- .TP
- \fB\-relheight \fIsize\fR
- \fISize\fR specifies the height for \fIwindow\fR.
- In this case the height is specified as a floating-point number
- relative to the height of the master: 0.5 means \fIwindow\fR will
- be half as high as the master, 1.0 means \fIwindow\fR will have
- the same height as the master, and so on.
- .TP
- \fB\-bordermode \fImode\fR
- \fIMode\fR determines the degree to which borders within the
- master are used in determining the placement of the slave.
- The default and most common value is \fBinside\fR.
- In this case the placer considers the area of the master to
- be the innermost area of the master, inside any border:
- an option of \fB\-x 0\fR corresponds to an x-coordinate just
- inside the border and an option of \fB\-relwidth 1.0\fR
- means \fIwindow\fR will fill the area inside the master's
- border.
- If \fImode\fR is \fBoutside\fR then the placer considers
- the area of the master to include its border;
- this mode is typically used when placing \fIwindow\fR
- outside its master, as with the options \fB\-x 0 \-y 0 \-anchor ne\fR.
- Lastly, \fImode\fR may be specified as \fBignore\fR, in which
- case borders are ignored: the area of the master is considered
- to be its official X area, which includes any internal border but
- no external border. A bordermode of \fBignore\fR is probably
- not very useful.
- .PP
- If the same value is specified separately with
- two different options, such as \fB\-x\fR and \fB\-relx\fR, then
- the most recent option is used and the older one is ignored.
- .PP
- The \fBplace slaves\fR command returns a list of all the slave
- .VS
- .VE
- windows for which \fIwindow\fR is the master.
- If there are no slaves for \fIwindow\fR then an empty string is
- returned.
- .PP
- The \fBplace forget\fR command causes the placer to stop managing
- the geometry of \fIwindow\fR. As a side effect of this command
- \fIwindow\fR will be unmapped so that it doesn't appear on the
- screen.
- If \fIwindow\fR isn't currently managed by the placer then the
- command has no effect.
- \fBPlace forget\fR returns an empty string as result.
- .PP
- The \fBplace info\fR command returns a list giving the current
- configuration of \fIwindow\fR.
- The list consists of \fIoption\-value\fR pairs in exactly the
- same form as might be specified to the \fBplace configure\fR
- command.
- If the configuration of a window has been retrieved with
- \fBplace info\fR, that configuration can be restored later by
- first using \fBplace forget\fR to erase any existing information
- for the window and then invoking \fBplace configure\fR with
- the saved information.
-
- .SH "FINE POINTS"
- .PP
- It is not necessary for the master window to be the parent
- of the slave window.
- This feature is useful in at least two situations.
- First, for complex window layouts it means you can create a
- hierarchy of subwindows whose only purpose
- is to assist in the layout of the parent.
- The ``real children'' of the parent (i.e. the windows that
- are significant for the application's user interface) can be
- children of the parent yet be placed inside the windows
- of the geometry-management hierarchy.
- This means that the path names of the ``real children''
- don't reflect the geometry-management hierarchy and users
- can specify options for the real children
- without being aware of the structure of the geometry-management
- hierarchy.
- .PP
- A second reason for having a master different than the slave's
- parent is to tie two siblings together.
- For example, the placer can be used to force a window always to
- be positioned centered just below one of its
- siblings by specifying the configuration
- .DS C
- \fB\-in \fIsibling\fB \-relx 0.5 \-rely 1.0 \-anchor n \-bordermode outside\fR
- .DE
- Whenever the sibling is repositioned in the future, the slave
- will be repositioned as well.
- .PP
- Unlike many other geometry managers (such as the packer)
- the placer does not make any attempt to manipulate the geometry of
- the master windows or the parents of slave windows (i.e. it doesn't
- set their requested sizes).
- To control the sizes of these windows, make them windows like
- frames and canvases that provide configuration options for this purpose.
-
- .SH KEYWORDS
- geometry manager, height, location, master, place, rubber sheet, slave, width
- .VE
-